进程使用的C＃检查文件

Question

让我有打开文件并追加内容的程序。 如果我应该运行两个apllication，我会得到另一个进程使用的IOException文件。如何检查Log.txt文件正在被另一个进程使用？

class Program 
{ 
    static void Main(string[] args) 
    { 
     FileInfo file = new FileInfo(@"D:\Log.txt"); 
     using (StreamWriter sw = file.AppendText()) 
     { 
      for (int i = 0; i < 1000; i++) 
      { 
       System.Threading.Thread.Sleep(100); 
       sw.WriteLine("Hello"); 
       sw.WriteLine("And"); 
       sw.WriteLine("Welcome"); 
      } 
      Console.WriteLine("The work is done"); 
     } 
    } 
} 

Answer 1

您应该尝试打开并写入文件。如果它正在使用中，你会得到一个异常。在.NET中没有其他方式。

protected virtual bool IsFileLocked(FileInfo file) 
{ 
    FileStream stream = null; 

    try 
    { 
     stream = file.Open(FileMode.Open, FileAccess.Read, FileShare.None); 
    } 
    catch (IOException) 
    { 
     //the file is unavailable because it is: 
     //still being written to 
     //or being processed by another thread 
     //or does not exist (has already been processed) 
     return true; 
    } 
    finally 
    { 
     if (stream != null) 
      stream.Close(); 
    } 

    //file is not locked 
    return false; 
}